From owner-freebsd-bugs@FreeBSD.ORG Sat Jan 10 19:50:18 2004 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E8AEB16A4CE for ; Sat, 10 Jan 2004 19:50:17 -0800 (PST) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7604B43D4C for ; Sat, 10 Jan 2004 19:50:15 -0800 (PST) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) i0B3oFFR010044 for ; Sat, 10 Jan 2004 19:50:15 -0800 (PST) (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.12.10/8.12.10/Submit) id i0B3oFri010043; Sat, 10 Jan 2004 19:50:15 -0800 (PST) (envelope-from gnats) Resent-Date: Sat, 10 Jan 2004 19:50:15 -0800 (PST) Resent-Message-Id: <200401110350.i0B3oFri010043@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, "George V. Neville-Neil" Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D1B8416A4CE for ; Sat, 10 Jan 2004 19:45:42 -0800 (PST) Received: from jchurch.neville-neil.com (jchurch.neville-neil.com [209.157.133.226]) by mx1.FreeBSD.org (Postfix) with ESMTP id AC4E043D3F for ; Sat, 10 Jan 2004 19:45:41 -0800 (PST) (envelope-from gnn@jchurch.neville-neil.com) Received: from jchurch.neville-neil.com (localhost [127.0.0.1]) i0B3jfqt000455 for ; Sat, 10 Jan 2004 19:45:41 -0800 (PST) (envelope-from gnn@jchurch.neville-neil.com) Received: (from gnn@localhost)i0B3jeMG000454; Sat, 10 Jan 2004 19:45:40 -0800 (PST) (envelope-from gnn) Message-Id: <200401110345.i0B3jeMG000454@jchurch.neville-neil.com> Date: Sat, 10 Jan 2004 19:45:40 -0800 (PST) From: "George V. Neville-Neil" To: FreeBSD-gnats-submit@FreeBSD.org X-Send-Pr-Version: 3.113 Subject: kern/61191: System panic on USB vs. Serial problems X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: "George V. Neville-Neil" List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 11 Jan 2004 03:50:18 -0000 >Number: 61191 >Category: kern >Synopsis: System panic on USB vs. Serial problems >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Jan 10 19:50:15 PST 2004 >Closed-Date: >Last-Modified: >Originator: George V. Neville-Neil >Release: FreeBSD 4.9-STABLE i386 >Organization: Neville-Neil Consulting >Environment: System: FreeBSD jchurch.neville-neil.com 4.9-STABLE FreeBSD 4.9-STABLE #6: Mon Dec 22 21:14:11 PST 2003 root@jchurch.neville-neil.com:/usr/obj/usr/local/src-STABLE/src/sys/JCHURCH i386 >Description: I am attempting to use my desktop as a console to my -CURRENT target system. To do this I have hooked COM1 on the desktop to COM1 on the target system with a nul modem, 9 pin, cable. While my cu session is open on the target I get random crashes of my desktop. I do not get a kernel core dump (alas) but the panic is: Jan 10 19:17:40 jchurch /kernel: panic: clist reservation botch This panic occurs only in one place in the kernel: sys/kern/tty_subr.c: cblock_alloc() { struct cblock *cblockp; cblockp = cfreelist; if (cblockp == NULL) panic("clist reservation botch"); cfreelist = cblockp->c_next; cblockp->c_next = NULL; cfreecount -= CBSIZE; return (cblockp); } My desktop has both the serial cable plugged into COM1 as well as a USB Keyboard and USB trackpad. I know this is USB related for two reasons: 1) Someone else mentioned they were having similar problems. 2) The machine actually hangs, and only resets when I unplug the USB keyboard. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted: